Hi Paul. Like Dr. Moze, I have both the Sony 300 (5 inch) and 505 (6 inch) Readers. I was planning on returning one of them (I bought the 300 first, but wanted to see what all the hype about the 505 was about, so I ordered one), but you know what? I love them both, and now I don't want to part with either one! I usually like to read the 505 at home, because of the larger screen, which is more like reading a printed book (ok, and the beautiful red colour, and the cool feel of the metal casing), and I like to take the 300 with me when I go out, because of the portability. Interestingly, the book I am reading now (One Minute to Midnight) displays as a larger font on the 300 at the same zoom level. So my advice is to buy both!